Security door grill



FIG. 1 is a perspective view of a security door grill of our new design, with portions of the door structure and screen illustrated in broken lines to provide environmental structure;

FIG. 2 is a front elevation view of our new design;

FIG. 3 is a rear elevation view of our new design; and,

FIG. 4 is a bottom view of our new design. 

CLAIM The ornamental design for security door grill, as shown and described. 